Device for simultaneously regulating the pressure of a series of pressure rolls adjacent a heating table



H. MEYER Feb. 11, 1936.

DEVICE FOR SIMULTANEOUSLY REGULATING THE PRESSURE OF A SERIES OF PRESSURE ROLLS ADJACENT A HEATING TABLE Filed D80. 5, 1954 Patented Feb. 11, 1936 UNITED STATES DEVICE FOR SIMULTANEOUSLY REGULAT- ING THE PRESSURE OF A SERIES OF PRESSURE ROLLS ADJACENT A HEATING TABLE Hans Meyer, Altona-Bahrenfeld. Germany Application December 5, 1934, Serial No. 756,189 In Germany June-19, 1933 4 Claims.

This invention relates to a device for regulating the loading of rolls for heating tables, especially for heating undulated cardboard, the device consisting of a rod system with abutments and tension springs by means of which the pressure of all pressure rolls can be regulated as desired. The operation of the known regulating devices for regulating theloading of rolls for heating tables, provided they comprise as generally absolutely necessary rolls or the like controlled by spring pressure, is based thereon that the springs controlling the rolls or the like are pressure springs which, loading the rolls, produce preponderately by their tension the pressure necessary for the treatment of the material and the dimensions of the same. The devices of this kind are not designed for the treatment of wood and are also not suited for undulated cardboard owing to their construction and possess the inconvenience that by them only a rough regulating of the pressure is possible by the tension springs acting in the sense of the net weight of the rolls; A complete relieving, when the rolls are in contact, such as is desirable for the treatment of undulated cardboard, cannot be obtained as the net weight of the rolls, which besides bear directly on to the material, cannot be compensated without altering the distance between the rolls and the material. These devices designed for progressively increasing loading are, however, owing to the employment of the pressure springs producing the loading, inconvenient in so far as they necessitate, with unevennesses of the material to be conveyed over the heating table, for instance on portions of the material which are thicker than others, stronger compression of the springs is exerted which acts as an increased counterforce on the material so that the facility of movement of the material is checked instead of being favored.

The regulating devices without springs, which have been proposed for altering the loading of rolls for undulated cardboard, represent an absolutely rigid system which is unsuitable for the practical application not only for this reason, but also because in such a device the distance between the rolls and the material in contact with the same changes when the pressure is varied. For this reason and because the material is conveyed directly between the pairs of rolls, such devices require for avoiding warping of the undulated cardboard separate smoothing elements journalled in the same brackets as the rolls increasing the inertia and the complicated construction so that the regulating which is already rough further loses in sensitiveness. Contrary hereto-the invention, having for its" object the avoidance of these inconveniences, is based upon a fundamentally difierent' idea which is expressed in the construction and arrangement of the springs and of the pressure rolls relative to the shaft which is oscillatably mounted in known manner, these" springs acting in opposition to the weight of the rolls so that these rolls are relieved during the regulating proceeding proper in such a manner that notwithstanding the alteration of the pressure the distance between the pressure rolls and the material remains permanently unchanged with interposition of a strap. During the regulating proceeding the relieving from full load to zero load takes place absolutely uniformly and elastically at the expense of the loading of the springs increasing continually accordingly, the maximum loading depending merely on the net weight of the pressure rolls. This construction permits therefore to carry out without increasing the inertia of the device the relieving of the same in such a manner that the undulated cardboard submitted to the pressing on can be removed from the table without any difiiculty at the endof the drying process.

An embodiment of the invention is illustrated by way of example in the accompanying drawing in which:-

Fig. 1 shows in side elevation a heating table for undulated cardboard.

Fig. 2 is a top plan view of Fig. 1.

Fig. 3 shows the loading regulator on larger scale.

The undulated cardboard b is placed on a table a and conveyed by means of a belt moving in the direction of the arrow 15. The loading of the belt 0 is effected by means of pressure rolls 5 journalled in levers m. These levers m, and for each of same a fork-shaped lever Z, are keyed on shafts 7'. Each shaft 1 is oscillatably mounted in brackets p, q. Through each forkedshaped lever 1 extends a rod d on which the loading regulators are fixed. The screw threaded end of rod d extends through a bracket J, and the rod is adapted to be turned in both directions by means of a hand wheel e.

The loading regulators consist each of a screw threaded bolt g keyed on the rod d, on which bolt an internally threaded sleeve h is screwed. In the other end of sleeve h an abutment i is inserted which is tubular and comprises a spiral spring :i. A scale is is fixed on the abutment i so that its graduation can move over the end of the threaded sleeve it. If the rolls s have to press on to the undulated cardboard with their full weight, the rod 01 is shifted by means of the hand wheel e in opposition to the direction of arrow t until the abutment i bears loosely against the corresponding forked lever l and the scale corresponding to the depressed spring points to full loading. If the weight of the rolls pressing on the cardboard has to be reduced, the rod d is moved by means of the hand wheel (I in the direction of the arrow t, whereby the spring relieves the coordinated pressure roll s without altering the distance of this roll from the belt 0. The spring compressed in this manner presses its abutment 12 against the forked lever l, which, acting through the intermediary of the shaft 1" and the levers m, 11. reduces the pressure of the roll 8.

If the spring a has been compressed so much that the scale it points to zero, i. e. that the weight of the roll s is completely neutralized, the rolls, when the moving of rod 11 in the direction of the arrow it continues, can be lifted from the conveyor belt and oscillated. The rod (1 extends through all rolls or groups of the same, so that from one point, the bracket f and hand wheel e, the groups of rolls or all rolls together can be regulated and influenced.

The weight of the rolls is thus adjusted in the simplest manner to the kind and width of the undulated cardboard so that this undulated cardboard is treated with the actually most favorable specific pressure.

I claim:

1. A device for simultaneously regulating the pressure of a series of rolls adjacent a heating table, comprising in combination with the heating table and. the pressure rolls, brackets fixed on said heating table one for each pressure roll, an axle journalled in each bracket, two forwardly directed arms for each roll keyed on each axle, a downwardly directed and rearwardly inclined bifurcated arm keyed near the right hand end of each axle at the outer side of the corresponding carrying arm, a horizontal rod extending through all said bifurcated arms a short distance above said table at the height of the central axis of said rolls, means for shifting said rod in 1ongitudinal direction, and loading regulators on said rod one for each roll arranged behind the corresponding bifurcated arm and adapted to exert a resilient pressure on said bifurcated arms and through the same on said rolls, the distance between the rolls and the table remaining the same.

2. A device for simultaneously regulating the pressure of a series of rolls adjacent a heating table as specified in claim 1, comprising in combination with the shiftable rod and the bifurcated arms, externally threaded screw bolts keyed on said rod one behind each bifurcated arm, sleeves threaded in the rear end portion screwed one on each bolt, a shoulder in each sleeve, abutments one inserted in the front end of each sleeve and bearing against the corresponding bifurcated arm, and spiral springs one in each sleeve bearing against the corresponding shoulder in the sleeve and against the corresponding abutment.

3. A device for simultaneously regulating the pressure of a series of rolls adjacent a heating table as specified in claim 1, comprising in combination with the shiftable rod and the bifurcated arms, externally threaded screw bolts keyed on said rod one behind each bifurcated arm, sleeves threaded in the rear end portion screwed one on each bolt, a shoulder in each sleeve, abutments one inserted in the front end of each sleeve and bearing against the corresponding bifurcated arm, spiral springs one in each sleeve bearing against the corresponding shoulder in the sleeve and against the corresponding abutment, and scales one on each abutment and extending over said sleeve adapted to indicate the degree of compression of the corresponding spring.

4. A device for simultaneously regulating the pressure of a series of rolls adjacent a heating table as specified in claim 1, comprising in combination with the pressure rolls the horizontal rod screw threaded at the front end and the loading regulators comprising pressure springs, a hand wheel on the threaded front endof said rod adapted to shift said rod and to thereby regulate the degree of compression of all pressure springs.

HANS MEYER. 

